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The Venet revolution came with a disgruntled lower class. The economics in Zarmatia became so terrible that the gulf between rich and poor was a dried up ocean bed. It was the perfect time to ferment revolution. 
At first, the Veneti were blamed, but that line of thinking was quickly curtailed by a charismatic leader, one of the few Veneti who gained their freedom. He was well respected, so when suggesting that free people themselves were little better than Veneti, the common people were coaxed into having their slave class join them in their endeavour. In fact, it was crucial. They were able to assassinate key figures of the aristocracy and military, creating distrust and paranoia towards all of their servants. 
There were few pitched battles. Poor logistics sent the military chasing ghosts. When the rebels turned to fight, it was always on their own terms. The fighting was brutal and bloody. The Zarmation army lost over 200,000 troops while the rebels took very few key losses.
When the Zarcon(emperor) was put on mock trial and killed, it effectively ended the Venet revolution. The lands of the Veneti were annexed with a halt on their domestic slave trade. Diplomats were sent out to solidify the new state in the eyes of the world and to work on peace with old enemies in hopes of not being overrun by a foreign power while they were weak.